Flexible touch panel and flexible display device

ABSTRACT

A flexible touch panel may include a flexible substrate. The flexible touch panel may further include a touch sensor layer that overlaps the flexible substrate. The flexible touch panel may further include a compensation film that overlaps the touch sensor layer and is configured to enable a neutral plane associated with the flexible touch panel to be positioned in the touch sensor layer when the flexible touch panel is bent.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and the benefit of Korean PatentApplication No. 10-2015-0003526 filed in the Korean IntellectualProperty Office on Jan. 9, 2015; the entire contents of the KoreanPatent Application are incorporated herein by reference.

BACKGROUND

(a) Field

The technical field is related to a flexible touch panel and a flexibledisplay device.

(b) Description of the Related Art

A touch panel may be disposed at a display area of a display device forrecognizing touches provided by a user of the display device. The touchpanel may function as an input device of the display device. The aboveinformation disclosed in this Background section is for enhancement ofunderstanding of the background. The Background section may containinformation that does not form the prior art that is already known inthis country to a person of ordinary skill in the art.

SUMMARY

An embodiment may be related to a flexible touch panel. The flexibletouch panel may include a flexible substrate. The flexible touch panelmay further include a touch sensor layer that overlaps the flexiblesubstrate. The flexible touch panel may further include a compensationfilm that overlaps the touch sensor layer and is configured to enable aneutral plane associated with the flexible touch panel to be positionedin the touch sensor layer when the flexible touch panel is bent.

The compensation film may have a multilayer structure.

The touch sensor layer may be positioned between the flexible substrateand the compensation film.

Two opposite sides of the touch sensor layer may directly contact theflexible substrate and the compensation film, respectively.

The flexible touch panel may include a covering member. The touch sensorlayer may include a touch sensor unit and a wiring unit electricallyconnected to the touch sensor unit. The covering member may conceal thewiring unit without substantially concealing the touch sensor unit.

An embodiment may be related to a method for manufacturing a flexibletouch panel. The method may include the following steps: providing atouch sensor layer; determining at least one of a thickness of acompensation film and a material of the compensation film for enabling aneutral plane associated with the flexible touch panel to be positionedin the touch sensor layer when the flexible touch panel may be bent; andproviding the compensation film such that the compensation film overlapsthe touch sensor layer.

The method may include providing the touch sensor layer on a substrate.The thickness of the compensation film may be determined based on atleast a material of the compensation layer, a thickness of the touchsensor layer, and a thickness of the substrate.

The method may include providing a covering member that partiallyoverlaps the touch sensor layer without completely overlapping the touchsensor layer. The thickness of the compensation film may be determinedbased on at least a thickness of the covering member.

A embodiment may be related to flexible display device that may includethe following elements: a flexible display panel; a touch sensor layeroverlapping the flexible display panel; and a compensation filmoverlapping the touch sensor layer and configured to enable a neutralplane associated with the flexible display device to be positioned inthe touch sensor layer when the flexible display device is bent.

The compensation film may include an organic layer and an inorganiclayer.

The touch sensor layer may directly contact the compensation film.

The flexible display device may include a viscoelastic layer positionedbetween the compensation film and the flexible display panel.

The flexible display device may include a covering member that directlycontacts the compensation film. The touch sensor layer may include atouch sensor unit and a wiring unit electrically connected to the touchsensor unit. The covering member may conceal the wiring unit.

The flexible display device may include the following elements: aflexible substrate that directly contacts the touch sensor layer; and acovering member that directly contacts the flexible substrate. Thecompensation film may be positioned between the flexible substrate andthe flexible display panel. The touch sensor layer may include a touchsensor unit and a wiring unit electrically connected to the touch sensorunit. The covering member may conceal the wiring unit.

The flexible display device may include the following elements: aflexible transparent window overlapping the touch sensor layer; and aviscoelastic layer positioned between the touch sensor layer and theflexible transparent window.

The flexible display device may include a blocking member that may beopaque and may directly contact the flexible transparent window. Thetouch sensor layer may include a touch sensor unit and a wiring unitelectrically connected to the touch sensor unit. The blocking member maypartially overlap the wiring unit without completely overlapping thewiring unit.

The flexible display device may include a covering member that partiallyoverlaps the touch sensor layer without completely overlapping the touchsensor layer. The touch sensor layer may include a touch sensor unit anda wiring unit electrically connected to the touch sensor unit. Thecovering member may substantially conceal the wiring unit withoutconcealing the touch sensor unit.

The covering member may include a comb pattern.

The flexible display device may include an opaque blocking member thatoverlaps a non-display area of the flexible display panel. The opaqueblocking member may partially overlap the covering member withoutcompletely overlapping the covering member.

The flexible display device may include a viscoelastic layer thatoverlaps the touch sensor layer. The covering member may be positionedinside the viscoelastic layer.

The viscoelastic layer may directly contact the compensation film

An embodiment may be related to a flexible touch panel that includes thefollowing elements: a flexible substrate; a touch sensor layer formed onthe flexible substrate; and a compensation film positioned on the touchsensor layer.

When a bending moment is applied to the flexible touch panel, a neutralplane may be positioned in the touch sensor layer.

The touch sensor layer may contact the flexible substrate and thecompensation film, respectively.

The touch sensor layer may include: a touch sensor unit formed in acentral region of the flexible substrate; and a wiring unit formed in aperipheral region of the flexible substrate.

The compensation film may include a covering member which covers thewiring unit.

The touch sensor unit may include transparent conductive oxide.

An embodiment may be related to a flexible display device that includesthe following elements: a flexible display panel; a flexible touch panelincluding a flexible substrate positioned on the flexible display panel,a compensation film facing the flexible substrate, and a touch sensorlayer positioned between the flexible substrate and the compensationfilm and formed on the flexible substrate; and a first viscoelasticlayer positioned between the flexible display panel and the flexibletouch panel.

When a bending moment is applied to the flexible touch panel, a neutralplane may be positioned in the touch sensor layer.

The touch sensor layer may contact the flexible substrate and thecompensation film, respectively.

The flexible display panel may include the following elements: a displayarea for displaying an image; and a non-display area adjacent to thedisplay area, and the touch sensor layer may include: a touch sensorunit formed in a central region of the flexible substrate, correspondingto the display area; and a wiring unit formed in an peripheral region ofthe flexible substrate, corresponding to the non-display area.

The flexible substrate may be positioned between the compensation filmand the flexible display panel, and the compensation film may include acovering member that covers the wiring unit.

The compensation film may be positioned between the flexible substrateand the flexible display panel, and the flexible substrate may include acovering member which covers the wiring unit.

The flexible display device may further include the following elements:a flexible window positioned on the flexible touch panel; and a secondviscoelastic layer positioned between the flexible touch panel and theflexible window.

An embodiment may be related to a flexible display device that includesthe following elements: a flexible display panel; a touch sensor layerformed on the flexible display panel; and a compensation film positionedon the touch sensor layer.

When a bending moment is applied to the flexible touch panel, a neutralplane may be positioned in the touch sensor layer.

The flexible display panel may include the following elements: a displayarea for displaying an image; and a non-display area adjacent to thedisplay area, and the touch sensor layer may include the followingelements: a touch sensor unit formed in a central region of the flexibledisplay panel, corresponding to the display area; and a wiring unitformed in an peripheral region of the flexible display panel,corresponding to the non-display area.

The compensation film may include a covering member that covers thewiring unit.

An embodiment may be related to a flexible display device that includesthe following elements: a flexible display panel including a touchsensor layer formed therein; and a compensation film positioned on theflexible display panel.

When a bending moment is applied to the flexible touch panel, a neutralplane may be positioned in the touch sensor layer.

The flexible display panel may include the following elements: a displayarea displaying an image; and a non-display area adjacent to the displayarea, the touch sensor layer may include: a touch sensor unit formed ina central region of the flexible display panel, corresponding to thedisplay area; and a wiring unit formed in an peripheral region of theflexible display panel, corresponding to the non-display area, and thecompensation film may include a covering member that covers the wiringunit.

According to embodiments, flexible touch panels and/or flexible displaydevices may have satisfactory durability against repetitive bending.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic cross-sectional view illustrating a portion of aflexible touch panel according to an embodiment.

FIG. 2 is a schematic cross-sectional view illustrating a portion of abent flexible touch panel according to an embodiment.

FIG. 3 is a schematic cross-sectional view illustrating a portion of aflexible display device according to an embodiment.

FIG. 4 is a schematic cross-sectional view illustrating a portion of aflexible display device according to an embodiment.

FIG. 5 is a schematic cross-sectional view illustrating a portion of aflexible display device according to an embodiment.

FIG. 6 is a schematic cross-sectional view illustrating a portion of aflexible display device according to an embodiment.

DETAILED DESCRIPTION OF EMBODIMENTS

Embodiments are described by way of illustration with reference to theaccompanying drawings. As those skilled in the art would realize, thedescribed embodiments may be modified in various different ways, allwithout departing from the spirit or scope.

The drawings and description are to be regarded as illustrative innature and not restrictive. Like reference numerals may designate likeelements in the specification. Description of like elements may be notrepeated.

Although the terms “first”, “second”, etc. may be used herein todescribe various elements, these elements, should not be limited bythese terms. These terms may be used to distinguish one element fromanother element. Thus, a first element discussed below may be termed asecond element without departing from the teachings. The description ofan element as a “first” element may not require or imply the presence ofa second element or other elements. The terms “first”, “second”, etc.may also be used herein to differentiate different categories or sets ofelements. For conciseness, the terms “first”, “second”, etc. mayrepresent “first-category (or first-set)”, “second-category (orsecond-set)”, etc., respectively.

In the drawings, thicknesses of layers, films, panels, regions, etc.,may be exaggerated for clarity.

In the description, when a first element (such as a layer, film, region,or substrate) is referred to as being “on” a second element, the firstelement can be directly on the second element, or one or moreintervening elements may also be present.

Unless explicitly described to the contrary, the word “comprise” andvariations such as “comprises” or “comprising”, will be understood toimply the inclusion of stated elements but not the exclusion of anyother elements. In the description, the term “connect” may mean“electrically connect”; the term “insulate” may mean “electricallyinsulate”.

FIG. 1 is a schematic cross-sectional view illustrating a portion (e.g.,an end portion) of a flexible touch panel 100 according to anembodiment. The flexible touch panel 100 is a touch recognition deviceand may be flexible, stretchable, foldable, bendable, and/or rollable.The flexible touch panel 100 includes a flexible substrate FS, a touchsensor layer TSL, and a compensation film SF.

The flexible substrate FS may be flexible, stretchable, foldable,bendable, and/or rollable. The flexible substrate FS is flexible,stretchable, foldable, bendable, and/or rollable, such that an entireflexible touch panel 100 may be flexible, stretchable, foldable,bendable, and/or rollable. For example, the flexible substrate FS may bea flexible film formed of a resin, such as polyimide.

The touch sensor layer TSL is formed on the flexible substrate FS.

The touch sensor layer TSL is positioned between the flexible substrateFS and the compensation film SF. Two opposite sides of the touch sensorlayer TSL may directly contact the flexible substrate FS and thecompensation film SF, respectively. The touch sensor layer TSL includesa touch sensor unit SE, a wiring unit WI, and an insulating layer IL.

The touch sensor unit SE is a touch recognition sensor and may bepositioned in a central region CA of the flexible substrate FS. Thetouch sensor unit SE includes transparent conductive oxide such asindium tin oxide (ITO) and/or indium zinc oxide (IZO). The touch sensorunit SE may be one of a mutual capacitance type touch sensor, aself-capacitance type touch sensor, etc. The touch sensor unit SE mayhave one or more known structures.

The wiring unit WI is connected to the touch sensor unit SE, may bepositioned in a peripheral region OA (or edge region OA) of the flexiblesubstrate FS, and may be positioned adjacent to the touch sensor unitSE. The wiring unit WI includes metals such as at least one of copper,gold, silver, platinum, and tungsten. The wiring unit WI may beelectrically connected between the touch sensor unit SE and a touchdriver (not illustrated) and may transfer a signal between the touchsensor unit SE and the touch driver. If the wiring unit WI may connectbetween the touch sensor unit SE and the touch driver, the wiring unitWI may be formed to have any structure.

The insulating layer IL covers the touch sensor unit SE and the wiringunit WI. A portion of the insulating layer IL may be positioned betweenadjacent touch sensor units SEs for preventing short-circuit between theadjacent touch sensor units SEs and for enabling capacitance to beprovided between the adjacent sensor units SEs. The insulating layer ILmay include one or more organic materials, such as polymer, and/or mayinclude one or more inorganic materials, such as at least one of oxide,nitride, and the like. For example, the insulating layer IL may includea viscoelastic material and/or may include at least one of silicon oxide(SiOx) and silicon nitride (SiNx).

The touch sensor layer TSL may be a central layer of the flexible touchpanel 100. When the flexible touch panel 100 is bent, a neutral plane NPmay be positioned in the touch sensor layer TSL.

The compensation film SF is positioned on the touch sensor layer TSL anddirectly contact the touch sensor layer TSL. The compensation film SFmay be attached to the touch sensor layer TSL. The compensation film SFmay include at least one of an organic layer and an inorganic layer. Thecompensation film SF may a laminate including a plurality of layers. Ina method for manufacturing the flexible touch panel 100, a thickness ofthe compensation film SF may be determined and/or configured based on aYoung's modulus of the compensation film SF a material of thecompensation film SF, one or more Young's modulus values of one or moreelements of the flexible touch panel 100, and/or one or more thicknessesof one or more elements of the flexible touch panel 100 (e.g., thethickness of the flexible substrate FS and/or the thickness of thecovering member DP) so that when the flexible touch panel 100 is bent, aneutral plane NP is positioned inside the touch sensor layer TSL. Thatis, the compensation film SF is configured to control a position of theneutral plane formed inside the flexible touch panel 100 when thebending moment is applied to the flexible touch panel 100.

The flexible touch panel 100 includes a covering member DP, which may beopaque and may overlap and/or cover the wiring unit WI. The coveringmember DP may be positioned on an upper surface of the compensation filmSF, on a lower surface of the compensation film SF, or inside thecompensation film SF. The covering member DP may be/include a lightblocking member for concealing the wiring unit WI from being visible orconspicuous. The decoration pattern DP is formed on the compensationfilm SF contacting the touch sensor layer TSL. Even if the overallflexible touch panel 100 is bent, the wiring unit WI may remainconcealed and/or inconspicuous.

In an embodiment, the covering member DP may include a pattern, such asa comb pattern.

FIG. 2 is a schematic cross-sectional view illustrating a portion (e.g.,a central portion) of the flexible touch panel 100 when the flexibletouch panel 100 is bent according to an embodiment.

As illustrated in FIG. 2, when the flexible touch panel 100 is bent, aposition of the neutral plane NP is controlled by the compensation filmSF, and thus the neutral plane NP may be positioned in the touch sensorlayer TSL. The neutral plane NP may be positioned between thecompensation film SF, which may undergo tension, and the flexiblesubstrate FS, which may undergo compression.

The neutral plane NP is positioned in the touch sensor layer TSL, andthus when the flexible touch panel 100 is bent, the touch sensor layerTSL may substantially keep an original length without significantlyexpanding or contracting. Therefore, the touch sensor layer TSL may beprevented from significant damage even if the flexible touch panel 100is bent repeatedly. In detail, the touch sensor unit SE of the touchsensor layer TSL is made of the transparent conductive oxide havingbrittleness as compared with metal and thus may be easily broken by thestress, but in the flexible touch panel 100 according to an embodiment,when the bending moment is applied, since the neutral plane NP is formedin the touch sensor unit SE of the touch sensor layer TSL, the touchsensor unit SE of the touch sensor layer TSL is prevented from beingbroken due to the stress. Advantageously, reliability and/or durabilityof the flexible touch panel 100 may be satisfactory.

Further, in the flexible touch panel 100 according to an embodiment, thecompensation film SF includes the decoration pattern DP positioned tocorrespond to the wiring unit WI of the touch sensor unit SE to preventthe wiring unit WI from being visualized from the outside, and thereforean additional configuration for preventing the wiring unit WI from beingvisualized from the outside is not required.

Hereinafter, a flexible display device according to an embodiment willbe described with reference to FIG. 3.

FIG. 3 is a schematic cross-sectional view illustrating a portion (e.g.,an end portion) of a flexible display device 1000 according to anembodiment.

As illustrated in FIG. 3, the flexible display device 1000 may beflexible, stretchable, foldable, bendable, and/or rollable and includesa flexible display panel 200, a first viscoelastic layer 300, theflexible touch panel 100, a second viscoelastic layer 400, and aflexible window 500.

The flexible display panel 200 may be flexible, stretchable, foldable,bendable, and/or rollable and includes a display area DA for displayingan image and a non-display area NDA that is adjacent to the display areaDA. The flexible display panel 200 may be an organic light emittingdisplay device including an organic light emitting diode. In one or moreembodiments, the flexible display panel 200 may be/include one or moreof a liquid crystal display (LCD), a plasma display (PD), a fieldemission display (FED), an electrophoretic display (EPD), anelectrowetting display (EWD), etc.

The first viscoelastic layer 300 is positioned between the flexibledisplay panel 200 and the flexible touch panel 100 and includes aviscoelastic material. The first viscoelastic layer 300 may be/include apressure sensitive adhesive (PSA) and/or one or more of otherviscoelastic materials.

The flexible touch panel 100 may have one or more of the featuresdiscussed above with reference to FIG. 1 and FIG. 2. The flexible touchpanel 100 is a touch recognition device and may be flexible,stretchable, foldable, bendable, or rollable. The flexible touch panel100 includes a flexible substrate FS, a touch sensor layer TSL, and acompensation film SF.

The flexible substrate FS may be flexible, stretchable, foldable,bendable, or rollable. The flexible substrate FS is flexible,stretchable, foldable, bendable, or rollable, such that an entireflexible touch panel 100 may be flexible, stretchable, foldable,bendable, or rollable. For example, the flexible substrate FS may have aform of a flexible film including a resin such as polyimide. Theflexible substrate FS is positioned on the flexible display panel 200and is positioned between the compensation film SF and the flexibledisplay panel 200.

The touch sensor layer TSL is formed on the flexible substrate FS.

The touch sensor layer TSL is positioned between the flexible substrateFS and the compensation film SF and contacts the flexible substrate FSand the compensation film SF, respectively. The touch sensor layer TSLincludes the touch sensor unit SE, the wiring unit WI, and theinsulating layer IL.

The touch sensor unit SE may overlap the display area DA of the flexibledisplay panel 200. The wiring unit WI may overlap the non-display areaNDA of the flexible display panel 200. The wiring unit WI includesmetals such as copper, gold, silver, platinum, and tungsten. The wiringunit WI connects between the touch sensor unit SE and a touch driver(not illustrated) and serves to transfer a signal between the touchsensor unit SE and the touch driver. If the wiring unit WI may connectbetween the touch sensor unit SE and the touch driver, the wiring unitWI may be formed to have any structure.

The insulating layer IL covers the touch sensor unit SE and the wiringunit WI and may be a portion in which capacitance is formed betweenadjacent touch sensor units SEs while preventing a short-circuit betweenthe adjacent touch sensor units SEs. The insulating layer IL may includeorganic materials such as polymer or inorganic materials including atleast one of oxide, nitride, and the like. For example, the insulatinglayer IL may include a viscoelastic material or may include at least oneof silicon oxide (SiOx) and silicon nitride (SiNx).

The touch sensor layer TSL may be positioned as the central layer of theoverall flexible touch panel 100 and when the bending moment is appliedto the flexible display device 1000, the neutral plane of the flexibletouch panel 100 may be formed on the touch sensor layer TSL.

The compensation film SF is positioned on the touch sensor layer TSL,and in detail, contacts the touch sensor layer TSL. The compensationfilm SF may be attached to the touch sensor layer TSL. The compensationfilm SF may include at least one of an organic layer and an inorganiclayer and may be formed as a laminate in which a plurality of layers isformed. The compensation film SF may have various thicknesses dependingon Young's modulus of the compensation film SF itself. For example, thecompensation film SF may have various thicknesses depending on Young'smodulus of a material forming the compensation film SF so that when thebending moment is applied to the flexible display device 1000, theneutral plane formed on the flexible touch panel 100 is formed on thetouch sensor layer TSL. That is, the compensation film SF is configuredto control the position of the neutral plane formed inside the flexibletouch panel 100 when the bending moment is applied to the flexible touchpanel 100.

The compensation film SF includes the decoration pattern DP which coversthe wiring unit WI. The decoration pattern DP is positioned tocorrespond to the wiring unit WI of the touch sensor layer TSL and maybe formed on the upper surface and the lower surface of compensationfilm SF or inside the compensation film SF. The decoration pattern DP isa light blocking member and the decoration pattern DP is positioned tocorrespond to the wiring unit WI to suppress the wiring unit WI of thetouch sensor layer TSL from being visualized from the outside. Thedecoration pattern DP is formed on the compensation film SF contactingthe touch sensor layer TSL, and therefore even though the overallflexible display device 1000 is bent, the wiring unit WI of the flexibletouch panel 100 is suppressed from being visualized from the outside.The compensation film SF faces the flexible substrate FS, having thetouch sensor layer TSL disposed therebetween. The second viscoelasticlayer 400 is positioned between the flexible touch panel 100 and theflexible window 500 and includes a viscoelastic material. The secondviscoelastic layer 400 may be/include a pressure sensitive adhesive(PSA) and/or one or more other viscoelastic materials.

The flexible window 500 is positioned on the flexible touch panel 100and may be flexible, stretchable, foldable, bendable, and/or rollable.The flexible window 500 may be transparent, such that images displayedby the flexible display panel 200 may be visible to a user of theflexible display device 1000. The flexible window 500 includes ablocking member 510 that is opaque and overlaps the non-display area(NDA) of the flexible display panel 200.

According to an embodiment, when the flexible display device 1000 isbent, the first viscoelastic layer 300 and the second viscoelastic layer400 may deform, and different neutral planes may exist in the flexiblewindow 500, the flexible touch panel 100, and the flexible display panel200, respectively.

In an embodiment, in the flexible touch panel 100, the compensation filmSF may enable the neutral plane NP to be positioned in the touch sensorlayer TSL. Therefore, the touch sensor layer TSL may be prevented fromsignificant damage even if the flexible display device 1000 is bentrepeatedly. Advantageously, reliability and/or durability of theflexible display device 1000 may be satisfactory.

The neutral plane NP is formed on the touch sensor layer TSL, and thuswhen the bending moment is applied to the flexible display device 1000,the touch sensor layer TSL is bent while keeping an original lengthwithout being expanded or contracted due to unique characteristics ofthe neutral plane NP, such that even though stress is repeatedly appliedto the flexible display device 1000 or stress over breaking strength isapplied to the flexible display device 1000, the touch sensor layer TSLis prevented from being broken due to the stress.

In detail, the touch sensor unit SE of the touch sensor layer TSL ismade of the transparent conductive oxide having brittleness as comparedwith metal and thus may be easily broken by the stress, but in theflexible display device 1000 according to an embodiment, when thebending moment is applied, the first viscoelastic layer 300 and thesecond viscoelastic layer 400 are each deformed and thus differentneutral planes are formed on the flexible window 500, the flexible touchpanel 100, and the flexible display panel 200, respectively, such thatthe stress applied to the whole flexible display device 1000 is relaxed,and at the same time, the neutral plane NP formed on the flexible touchpanel 100 is formed on the touch sensor unit SE, such that the touchsensor unit SE of the touch sensor layer TSL is prevented from beingbroken due to the stress. That is, the flexible display device 1000having improved durability against the repetitive bending is provided.

In an embodiment, the compensation film SF includes the covering memberDP may sufficiently conceal the wiring unit WI of the touch sensor unitSE. Therefore, no additional configuration for concealing the wiringunit WI may be required. For example, the blocking member 510 of theflexible window 500 may not need to overlap the wiring unit WI, suchthat a width of the flexible window 500 may be minimized.Advantageously, the size of the flexible display device 1000 may beminimized.

Further, the wiring unit WI of the flexible touch panel 100 is blockedby the decoration pattern DP of the flexible touch panel 100 itself, andthus the wiring unit WI of the flexible touch panel 100 is preventedfrom being visualized from the outside independent of the position ofthe blocking member 510 of the flexible window 500, such that theblocking member 510 of the flexible window 500 need not overlap thewiring unit WI.

Hereinafter, a flexible display device according to an embodiment willbe described with reference to FIG. 4.

FIG. 4 is a schematic cross-sectional view illustrating a portion (e.g.,an end portion) of a flexible display device 1000 according to anembodiment. The flexible display device 1000 may have one or more of thefeatures discussed above with reference to FIG. 1, FIG. 2, and FIG. 3.The flexible display device 1000 includes a flexible display panel 200,a first viscoelastic layer 300, a flexible touch panel 100, a secondviscoelastic layer 400, and a flexible window 500, which may have one ormore of the features discussed above with reference to FIG. 1, FIG. 2,and FIG. 3.

The flexible touch panel 100 may have one or more of the features of theflexible touch panel 100 discussed with reference to FIG. 1, FIG. 2, andFIG. 3. The flexible touch panel 100 includes a flexible substrate FS, atouch sensor layer TSL, a compensation film SF, and a covering memberDP. The covering member DP of the flexible touch panel 100 may have oneor more of the features of the covering member 100 discussed withreference to FIG. 1, FIG. 2, and FIG. 3. In the flexible touch panel100, the covering member DP may be positioned on an upper surface of theflexible substrate FS, on a lower surface of the flexible substrate FS,or inside the flexible substrate FS. Even if the flexible display device1000 is bent, the covering member DP may effectively and/orsubstantially conceal the wiring unit WI.

The flexible substrate FS is positioned on the flexible display panel200, having the touch sensor layer TSL and the compensate film SFdisposed therebetween. The touch sensor layer TSL is formed on theflexible substrate FS. The flexible substrate FS includes the decorationpattern DP which covers the wiring unit WI. The decoration pattern DP ispositioned to correspond to the wiring unit WI of the touch sensor layerTSL and may be formed on an upper surface and a lower surface of theflexible substrate FS or inside the flexible substrate FS. Thedecoration pattern DP is a light blocking member and the decorationpattern DP is positioned to correspond to the wiring unit WI to suppressthe wiring unit WI of the touch sensor layer TSL from being visualizedfrom the outside. The decoration pattern DP is formed on the flexiblesubstrate FS contacting the touch sensor layer TSL, and therefore eventhough the overall flexible display device 1000 is bent, the wiring unitWI of the flexible touch panel 100 is suppressed from being visualizedfrom the outside. The compensation film SF faces the flexible substrateFS, having the touch sensor layer TSL disposed therebetween.

The touch sensor layer TSL is positioned between the flexible substrateFS and the compensation film SF and contacts the flexible substrate FSand the compensation film SF, respectively. The touch sensor layer TSLincludes the touch sensor unit SE, the wiring unit WI, and theinsulating layer IL.

The touch sensor layer TSL may be positioned as the central layer of theoverall flexible touch panel 100 and when the bending moment is appliedto the flexible display device 1000, the neutral plane of the flexibletouch panel 100 may be formed on the touch sensor layer TSL.

In the flexible display device 1000, the compensation film SF ispositioned between the flexible substrate FS and the flexible displaypanel 200 and directly contacts each of the insulating layer IL of thetouch sensor layer TSL and the first viscoelastic layer 300. Theflexible substrate FS is positioned between the compensation film SF andthe flexible window 500 and directly contacts each of the touch sensorlayer TSL and the second viscoelastic layer 400. A thickness of thecompensation film SF and/or a material of the compensation film SF maybe configured and/or determined to enable a neutral plane of theflexible touch panel 100 to be positioned in the touch sensor layer TSLwhen the flexible touch panel 100 is bent and/or when the flexibledisplay device 1000 is bent. Therefore, the touch sensor layer TSL maybe prevented from significant damage even if the flexible display device1000 is bent repeatedly. Advantageously, reliability and/or durabilityof the flexible display device 1000 may be satisfactory.

In the flexible display device 1000 according to an embodiment, when thebending moment is applied to the flexible display device 1000, the firstviscoelastic layer 300 and the second viscoelastic layer 400 are eachdeformed depending on the stress applied to the flexible display device1000 due to unique characteristics of the viscoelastic materials of eachof the first viscoelastic layer 300 and the second viscoelastic layer400, and therefore different neutral planes are formed on the flexiblewindow 500, the flexible touch panel 100, and the flexible display panel200, respectively, such that the stress applied to the whole flexibledisplay device 1000 is relaxed.

In this case, the position of the neutral plane NP formed on theflexible touch panel 100 is controlled by the compensation film SF, andthus the neutral plane NP is formed on the touch sensor layer TSL. Theneutral plane NP is formed on the touch sensor layer TSL, and thus whenthe bending moment is applied to the flexible display device 1000, thetouch sensor layer TSL is bent while keeping an original length withoutbeing expanded or contracted due to unique characteristics of theneutral plane NP, such that even though stress is repeatedly applied tothe flexible display device 1000 or stress over breaking strength isapplied to the flexible display device 1000, the touch sensor layer TSLis prevented from being broken due to the stress.

In detail, the touch sensor unit SE of the touch sensor layer TSL ismade of the transparent conductive oxide having brittleness as comparedwith metal and thus may be easily broken by the stress, but in theflexible display device 1000 according to an embodiment, when thebending moment is applied, the first viscoelastic layer 300 and thesecond viscoelastic layer 400 are each deformed and thus differentneutral planes are formed on the flexible window 500, the flexible touchpanel 100, and the flexible display panel 200, respectively, such thatthe stress applied to the whole flexible display device 1000 is relaxed,and at the same time, the neutral plane NP formed on the flexible touchpanel 100 is formed on the touch sensor unit SE, such that the touchsensor unit SE of the touch sensor layer TSL is prevented from beingbroken due to the stress.

That is, the flexible display device 1000 having improved durabilityagainst the repetitive bending is provided.

Further, in the flexible display device 1000 according to an embodiment,the flexible substrate FS includes the decoration pattern DP positionedto correspond to the wiring unit WI of the touch sensor unit SE toprevent the wiring unit WI from being visualized from the outside, andtherefore an additional configuration for preventing the wiring unit WIfrom being visualized from the outside is not required. As such, thewiring unit WI of the flexible touch panel 100 is blocked by thedecoration pattern DP of the flexible touch panel 100 itself and thusthe position of the end of the flexible touch panel 100 may moveindependent of the position of the blocking member 510 of the flexiblewindow 500, such that the width of the non-display area of the wholeflexible display device 1000 may be narrow.

Further, the wiring unit WI of the flexible touch panel 100 is blockedby the decoration pattern DP of the flexible touch panel 100 itself andthus the wiring unit WI of the flexible touch panel 100 is preventedfrom being visualized from the outside independent of the position ofthe blocking member 510 of the flexible window 500, such that theblocking member 510 of the flexible window 500 need not overlap thewiring unit WI.

Hereinafter, a flexible display device according to an embodiment willbe described with reference to FIG. 5. Hereinafter, only configurationsdifferent from those of the flexible display device according to anembodiment described above will be described.

FIG. 5 is schematic a cross-sectional view illustrating a portion (e.g.,an end portion) of a flexible display device 1000 according to anembodiment. The flexible display device 1000 may have one or more of thefeatures discussed above with reference to FIG. 1, FIG. 2, and FIG. 3.The flexible display device 1000 includes a flexible display panel 200,a touch sensor layer TSL, a compensation film SF, a second viscoelasticlayer 400, a flexible window 500, and a covering member DP, which mayhave one or more of the features discussed above with reference to FIG.1, FIG. 2, and FIG. 3.

The flexible display panel 200 may include a viscoelastic layer inaddition to elements configured for displaying images.

Two opposite sides of the touch sensor layer TSL may directly contactthe viscoelastic layer the flexible display panel 200 and thecompensation film SF, respectively. The touch sensor layer TSL may haveone or more features discussed above with reference to FIG. 1, FIG. 2,and FIG. 3. A side surface of the touch sensor layer TSL may be aligned(i.e., flush or on a same plane) with a side of the flexible display 200and may be perpendicular to the flexible window 500.

Two opposite sides of the compensation film SF may directly contact thetouch sensor layer TSL and the second viscoelastic layer 400,respectively. A thickness of the compensation film SF and/or a materialof the compensation film SF may be configured and/or determined toenable a neutral plane of the flexible display device 1000 to bepositioned in the touch sensor layer TSL when the flexible displaydevice 1000 is bent. Therefore, the touch sensor layer TSL may beprevented from significant damage even if the flexible display device1000 is bent repeatedly. Advantageously, reliability and/or durabilityof the flexible display device 1000 may be satisfactory.

The compensation film SF may be attached to the touch sensor layer TSL.The compensation film SF may include at least one of an organic layerand an inorganic layer and may be formed as a laminate in which aplurality of layers is formed.

The compensation film SF may have various thicknesses depending onYoung's modulus of the compensation film SF itself For example, thecompensation film SF may have various thicknesses depending on Young'smodulus of a material forming the compensation film SF so that when thebending moment is applied to the flexible display device 1000, theneutral plane formed on the flexible display panel 200 is formed on thetouch sensor layer TSL. That is, the compensation film SF is configuredto control the position of the neutral plane formed inside the flexibledisplay panel 200 when the bending moment is applied to the flexibledisplay panel 200.

The compensation film SF includes the decoration pattern DP which coversthe wiring unit WI. The decoration pattern DP is positioned tocorrespond to the wiring unit WI of the touch sensor layer TSL and maybe formed on the upper surface and the lower surface of compensationfilm SF or inside the compensation film SF. The decoration pattern DP isa light blocking member and the decoration pattern DP is positioned tocorrespond to the wiring unit WI to suppress the wiring unit WI of thetouch sensor layer TSL from being visualized from the outside. Thedecoration pattern DP is formed on the compensation film SF contactingthe touch sensor layer TSL, and therefore even though the overallflexible display device 1000 is bent, the wiring unit WI of the touchsensor layer TSL is suppressed from being visualized from the outside.

In the flexible display device 1000 according to an embodiment, when thebending moment is applied to the flexible display device 1000, thesecond viscoelastic layer 400 is deformed depending on the stressapplied to the flexible display device 1000 due to the uniquecharacteristics of the viscoelastic materials of the second viscoelasticlayer 400, and therefore different neutral planes are formed on theflexible window 500 and the flexible display panel 200, respectively,such that the stress applied to the whole flexible display device 1000is relaxed.

In this case, the position of the neutral plane NP formed on theflexible display panel 200 is controlled by the compensation film SF,and thus the neutral plane NP is formed on the touch sensor layer TSL.The neutral plane NP is formed on the touch sensor layer TSL, and thuswhen the bending moment is applied to the flexible display device 1000,the touch sensor layer TSL is bent while keeping an original lengthwithout being expanded or contracted due to unique characteristics ofthe neutral plane NP, such that even though stress is repeatedly appliedto the flexible display device 1000 or stress over breaking strength isapplied to the flexible display device 1000, the touch sensor layer TSLis prevented from being broken due to the stress.

In detail, the touch sensor unit SE of the touch sensor layer TSL ismade of the transparent conductive oxide having brittleness as comparedwith metal and thus may be easily broken by the stress, but in theflexible display device 1000 according to an embodiment, when thebending moment is applied, the second viscoelastic layer 400 is deformedand thus different neutral planes are formed on the flexible window 500and the flexible display panel 200, respectively, such that the stressapplied to the whole flexible display device 1000 is relaxed, and at thesame time, the neutral plane NP formed on the flexible display panel 200is formed on the touch sensor unit SE, such that the touch sensor unitSE of the touch sensor layer TSL is prevented from being broken due tothe stress.

That is, the flexible display device 1000 having improved durabilityagainst repetitive bending is provided.

Further, in the flexible display device 1000 according to an embodiment,the compensation film SF includes the decoration pattern DP positionedto correspond to the wiring unit WI of the touch sensor unit SE toprevent the wiring unit WI from being visualized from the outside, andtherefore an additional configuration for preventing the wiring unit WIfrom being visualized from the outside is not required. As such, thewiring unit WI of the touch sensor layer TSL is blocked by thedecoration pattern DP of the compensation film SF, and thus the positionof the end of the flexible display panel 200 may move independent of theposition of the blocking member 510 of the flexible window 500, suchthat the width of the non-display area of the whole flexible displaydevice 1000 may be narrow.

Further, the wiring unit WI of the flexible display panel 200 is blockedby the decoration pattern DP of the flexible display panel 200 itselfand thus the wiring unit WI of the flexible display panel 200 isprevented from being visualized from the outside independent of theposition of the blocking member 510 of the flexible window 500, suchthat the blocking member 510 of the flexible window 500 need not overlapthe wiring unit WI.

Hereinafter, a flexible display device according to an embodiment willbe described with reference to FIG. 6.

FIG. 6 is a schematic cross-sectional view illustrating a portion (e.g.,an end portion) of a flexible display device 1000 according to anembodiment. The flexible display device 1000 may have one or more of thefeatures discussed above with reference to FIG. 1, FIG. 2, FIG. 3, FIG.4, and FIG. 5.

The flexible display device 1000 according includes a flexible displaypanel 200, a compensation film SF, a second viscoelastic layer 400, anda flexible window 500.

A touch sensor layer TSL is positioned inside the flexible display panel200. The touch sensor layer TSL includes a touch sensor unit SE, awiring unit WI, and an insulating layer IL. The touch sensor unit SE ispositioned in the display area of the flexible display panel 200, andthe wiring unit WI is positioned in the non-display area NDA of theflexible display panel 200.

The compensation film SF overlaps the touch sensor layer TSL anddirectly contacts the flexible display panel 200. The compensation filmSF may be attached to the flexible display panel 200 and may be spaced(e.g., by an adhesive and/or a viscoelastic layer) from the touch sensorlayer TSL. A thickness of the compensation film SF and/or a material ofthe compensation film SF may be configured and/or determined to enable aneutral plane of the flexible display panel 200 and/or the flexibledisplay device 1000 to be positioned in the touch sensor layer TSL whenthe flexible display panel 200 and/or the flexible display device 1000is bent. Therefore, the touch sensor layer TSL may be prevented fromsignificant damage even if the flexible display panel 200 is bentrepeatedly and/or even if the flexible display device 1000 is bentrepeatedly. Advantageously, reliability and/or durability of theflexible display panel 200 and/or the flexible display device 1000 maybe satisfactory.

The compensation film SF may include at least one of an organic layerand an inorganic layer and may be formed as a laminate in which aplurality of layers is formed. The compensation film SF may have variousthicknesses depending on Young's modulus of the compensation film SFitself. For example, the compensation film SF may have variousthicknesses depending on Young's modulus of a material forming thecompensation film SF so that when the bending moment is applied to theflexible display device 1000, the neutral plane formed on the flexibledisplay panel 200 is formed on the touch sensor layer TSL. That is, thecompensation film SF is configured to control the position of theneutral plane formed inside the flexible display panel 200 when thebending moment is applied to the flexible display panel 200.

The compensation film SF includes the decoration pattern DP which coversthe wiring unit WI. The decoration pattern DP is positioned tocorrespond to the wiring unit WI of the touch sensor layer TSL and maybe formed on the upper surface and the lower surface of compensationfilm SF or inside the compensation film SF. The decoration pattern DP isa light blocking member and the decoration pattern DP is positioned tocorrespond to the wiring unit WI to suppress the wiring unit WI of thetouch sensor layer TSL from being visualized from the outside. Thedecoration pattern DP is formed on the compensation film SF contactingthe touch sensor layer TSL, and therefore even though the overallflexible display device 1000 is bent, the wiring unit WI of the touchsensor layer TSL is suppressed from being visualized from the outside.

In the flexible display device 1000 according to an embodiment, when thebending moment is applied to the flexible display device 1000, thesecond viscoelastic layer 400 is deformed depending on the stressapplied to the flexible display device 1000 due to the uniquecharacteristics of the viscoelastic materials of the second viscoelasticlayer 400, and therefore different neutral planes are formed on theflexible window 500 and the flexible display panel 200, respectively,such that the stress applied to the whole flexible display device 1000is relaxed.

In this case, the position of the neutral plane NP formed on theflexible display panel 200 is controlled by the compensation film SF,and thus the neutral plane NP is formed on the touch sensor layer TSL.The neutral plane NP is formed on the touch sensor layer TSL, and thuswhen the bending moment is applied to the flexible display device 1000,the touch sensor layer TSL is bent while keeping an original lengthwithout being expanded or contracted due to unique characteristics ofthe neutral plane NP, such that even though stress is repeatedly appliedto the flexible display device 1000 or stress over breaking strength isapplied to the flexible display device 1000, the touch sensor layer TSLis prevented from being broken due to the stress.

In detail, the touch sensor unit SE of the touch sensor layer TSL ismade of the transparent conductive oxide having brittleness as comparedwith metal and thus may be easily broken by the stress, but in theflexible display device 1000 according to an embodiment, when thebending moment is applied, the second viscoelastic layer 400 is deformedand thus different neutral planes are formed on the flexible window 500and the flexible display panel 200, respectively, such that the stressapplied to the whole flexible display device 1000 is relaxed, and at thesame time, the neutral plane NP formed on the flexible display panel 200is formed on the touch sensor unit SE, such that the touch sensor unitSE of the touch sensor layer TSL is prevented from being broken due tothe stress.

That is, the flexible display device 1000 having improved durabilityagainst repetitive bending is provided.

Further, in the flexible display device 1000 according to an embodiment,the compensation film SF includes the decoration pattern DP positionedto correspond to the wiring unit WI of the touch sensor unit SE toprevent the wiring unit WI from being visualized from the outside, andtherefore an additional configuration for preventing the wiring unit WIfrom being visualized from the outside is not required. As such, thewiring unit WI of the touch sensor layer TSL is blocked by thedecoration pattern DP of the compensation film 100 and thus the positionof the end of the flexible display panel 200 may move independent of theposition of the blocking member 510 of the flexible window 500, suchthat the width of the non-display area of the whole flexible displaydevice 1000 may be narrow.

Further, the wiring unit WI of the flexible display panel 200 is blockedby the decoration pattern DP of the flexible display panel 200 itselfand thus the wiring unit WI of the flexible display panel 200 isprevented from being visualized from the outside independent of theposition of the blocking member 510 of the flexible window 500, suchthat the blocking member 510 of the flexible window 500 need not overlapthe wiring unit WI.

While some embodiments have been described, possible embodiments are notlimited to the described embodiments. Embodiments are intended to covervarious modifications and equivalent arrangements that are within thespirit and scope of the appended claims.

What is claimed is:
 1. A flexible touch panel, comprising: a flexiblesubstrate; a touch sensor layer overlapping the flexible substrate; anda compensation film overlapping the touch sensor layer and configured toenable a neutral plane associated with the flexible touch panel to bepositioned in the touch sensor layer when the flexible touch panel isbent.
 2. The flexible touch panel of claim 1, wherein: the compensationfilm has a multilayer structure.
 3. The flexible touch panel of claim 1,wherein: the touch sensor layer is positioned between the flexiblesubstrate and the compensation film.
 4. The flexible touch panel ofclaim 1, further comprising: a covering member, wherein: the touchsensor layer includes a touch sensor unit and a wiring unit electricallyconnected to the touch sensor unit, and wherein the covering memberconceals the wiring unit without concealing the touch sensor unit.
 5. Amethod for manufacturing a flexible touch panel, the method comprising:providing a touch sensor layer; determining at least one of a thicknessof a compensation film and a material of the compensation film forenabling a neutral plane associated with the flexible touch panel to bepositioned in the touch sensor layer when the flexible touch panel isbent; and providing the compensation film such that the compensationfilm overlaps the touch sensor layer.
 6. The method of claim 5, furthercomprising: providing the touch sensor layer on a substrate, wherein:the thickness of the compensation film is determined based on at least amaterial of the compensation layer, a thickness of the touch sensorlayer, and a thickness of the substrate.
 7. The method of claim 5,further comprising: providing a covering member that partially overlapsthe touch sensor layer without completely overlapping the touch sensorlayer, wherein: the thickness of the compensation film is determinedbased on at least a thickness of the covering member.
 8. A flexibledisplay device, comprising: a flexible display panel; a touch sensorlayer overlapping the flexible display panel; and a compensation filmoverlapping the touch sensor layer and configured to enable a neutralplane associated with the flexible display device to be positioned inthe touch sensor layer when the flexible display device is bent.
 9. Theflexible display device of claim 8, wherein: the compensation filmincludes an organic layer and an inorganic layer.
 10. The flexibledisplay device of claim 8, wherein: the touch sensor layer directlycontacts the compensation film.
 11. The flexible display device of claim8, further comprising: a viscoelastic layer positioned between thecompensation film and the flexible display panel.
 12. The flexibledisplay device of claim 8, further comprising: a covering member thatdirectly contacts the compensation film, wherein: the touch sensor layerincludes a touch sensor unit and a wiring unit electrically connected tothe touch sensor unit, and the covering member conceals the wiring unit.13. The flexible display device of claim 8, further comprising: aflexible substrate that directly contacts the touch sensor layer; and acovering member that directly contacts the flexible substrate, wherein:the compensation film is positioned between the flexible substrate andthe flexible display panel, the touch sensor layer includes a touchsensor unit and a wiring unit electrically connected to the touch sensorunit, and the covering member conceals the wiring unit.
 14. The flexibledisplay device of claim 8, further comprising: a flexible transparentwindow overlapping the touch sensor layer; and a viscoelastic layerpositioned between the touch sensor layer and the flexible transparentwindow.
 15. The flexible display device of claim 14, further comprising:a blocking member that is opaque and directly contacts the flexibletransparent window, wherein: the touch sensor layer includes a touchsensor unit and a wiring unit electrically connected to the touch sensorunit, and the blocking member partially overlaps the wiring unit withoutcompletely overlapping the wiring unit.
 16. The flexible display deviceof claim 8, further comprising: a covering member that partiallyoverlaps the touch sensor layer without completely overlapping the touchsensor layer, wherein: the touch sensor layer includes a touch sensorunit and a wiring unit electrically connected to the touch sensor unit,the covering member substantially conceals the wiring unit withoutconcealing the touch sensor unit.
 17. The flexible display device ofclaim 16, wherein: the covering member includes a comb pattern.
 18. Theflexible display device of claim 16, further comprising: an opaqueblocking member that overlaps a non-display area of the flexible displaypanel, wherein: the opaque blocking member partially overlaps thecovering member without completely overlapping the covering member. 19.The flexible display device of claim 16, further comprising: aviscoelastic layer that overlaps the touch sensor layer, wherein: thecovering member is positioned inside the viscoelastic layer.
 20. Theflexible display device of claim 19, wherein: the viscoelastic layerdirectly contacts the compensation film.